Intercalation

Definitions

1. A period inserted into a calendar as in a leap year.
   countable, uncountable
2. The reversible insertion of a molecule between two others.
   countable, physical, uncountable
3. A layer introduced into a pre-existing sequence.
   countable, uncountable

Equivalents

Examples

“Their exact relationship to the host-rock is obscure but from their texture and observed metamorphic relationship they are thought to be intrusive dykes rather than intercalations of more basic lava.”

CEFR level